<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>响应页面</title>
</head>
<body>
<p style="text-align: center;">这里是b.xuhaodong.cn/b.html</p>

<script>
    var data = 'hello world from b.xuhaodong.cn! 🤢';
    document.domain = 'xuhaodong.cn';//设置成主域
</script>
</body>
</html>